Error Lnk2019 Unresolved External Symbol Library
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C++ Error Lnk2019 Unresolved External Symbol
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Error Lnk2019 Unresolved External Symbol Winmain@16 Referenced In Function ___tmaincrtstartup
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Error Lnk2019 Unresolved External Symbol Public __thiscall Referenced In Function _main
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Error Lnk2019 Unresolved External Symbol Void __cdecl
Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it error lnk2019 unresolved external symbol main referenced in function __tmaincrtstartup only takes a minute: Sign up What is an undefined reference/unresolved external symbol error and how do I fix it? up vote 709 down vote favorite 316 What are undefined reference/unresolved external symbol errors? What are common causes and how https://msdn.microsoft.com/en-us/library/799kze2z.aspx to fix/prevent them? Feel free to edit/add your own. c++ linker-error undefined-reference c++-faq unresolved-external share|improve this question edited Aug 4 '14 at 13:33 Arno Duvenhage 805517 asked Sep 24 '12 at 22:27 Luchian Grigore 167k28295455 3 One thing to consider adding is how to deal with "undefined vtable" and "undefined typeinfo" errors in particular (since they are less obvious than undefined functions or variables). –Jeremiah Willcock Jul 16 '13 at 18:25 1 I've been marking this question to http://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-symbol-error-and-how-do-i-fix be a possible dupe of this one. But after going through all of your (brilliant) answers, I can't see this case covered here. I'm aware it's specific about how an IDE sets up the project type and it's linkage dependencies. But that's a such frequently asked question I think it would be worth covered (maybe just with a link to another appropriate dupe) here. If it is already, and I just didn't spot it, forget about this request/comment. –πάντα ῥεῖ Mar 3 '14 at 21:14 @LuchianGrigore 'feel free to add an answer' I preferred to add the relevant link (IMHO) your primary answer, if you'd like to permit. –πάντα ῥεῖ Mar 3 '14 at 22:36 Pretty common mistake is that you define a function as a standalone and forget the class selector (e.g. A::) in your .cpp file: You do this (wrong): void myFunc() { /* do stuff */ } Instead of this (right): void A::myFunc() { /* do stuff */ } –jave.web Mar 11 '15 at 18:45 3 If this happens to you with a Qt signal, you most likely forgot the Q_OBJECT macro. –ManuelSchneid3r Jun 18 '15 at 13:47 | show 1 more comment 25 Answers 25 active oldest votes up vote 425 down vote accepted Compiling a C++ program takes place in several steps, as specified by 2.2 (credits to Keith Thompson for the reference): The precedence among the sy
Support Answers MathWorks Search MathWorks.com MathWorks Answers Support MATLAB Answers™ MATLAB Central Community Home MATLAB Answers File Exchange Cody Blogs Newsreader Link Exchange ThingSpeak Anniversary https://www.mathworks.com/matlabcentral/answers/98211-why-do-i-receive-link-errors-lnk2019-when-compiling-in-microsoft-visual-c-2005 Home Ask Answer Browse More Contributors Recent Activity Flagged Content Flagged as http://digital.ni.com/public.nsf/allkb/36F561F57095CADB86257CC4006C275B Spam Help MATLAB Central Community Home MATLAB Answers File Exchange Cody Blogs Newsreader Link Exchange ThingSpeak Anniversary Home Ask Answer Browse More Contributors Recent Activity Flagged Content Flagged as Spam Help Trial software MathWorks Support Team (view profile) 13,595 questions 13,595 answers 13,594 accepted answers Reputation: 2,578 error lnk2019 Vote0 Why do I receive link errors (LNK2019) when compiling in Microsoft Visual C++ 2005? Asked by MathWorks Support Team MathWorks Support Team (view profile) 13,595 questions 13,595 answers 13,594 accepted answers Reputation: 2,578 on 27 Jun 2009 Latest activity Commented on by Madhura Suresh Madhura Suresh (view profile) 0 questions 59 answers 5 accepted answers Reputation: 34 on 12 error lnk2019 unresolved Feb 2015 Accepted Answer by MathWorks Support Team MathWorks Support Team (view profile) 13,595 questions 13,595 answers 13,594 accepted answers Reputation: 2,578 889 views (last 30 days) 889 views (last 30 days) I use MATLAB Compiler to build a C++ shared library "libmatrixp.dll". When I build the driver "matrixdriver.cpp" in Microsoft Visual C++ 2005, after properly setting the link and include paths, I receive link errors: 1>------ Build started: Project: matrixtest, Configuration: Debug Win32------ 1>Compiling... 1>matrixdriver.cpp 1>Compiling manifest to resources... 1>Linking... 1>matrixdriver.obj : error LNK2019: unresolved external symbol _mclTerminateApplication referenced in function __catch$?run_main@@YAPAXPAX@Z$0 1>matrixdriver.obj : error LNK2019: unresolved external symbol _libmatrixpTerminate referenced in function __catch$?run_main@@YAPAXPAX@Z$0 1>matrixdriver.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) void __cdecl eigmatrix(int,class mwArray &,class mwArray const &)" (__imp_?eigmatrix@@YAXHAAVmwArray@@ABV1@@Z) referenced in function "void * __cdecl run_main(void *)" (?run_main@@YAPAXPAX@Z) 1>matrixdriver.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) void __cdecl multiplymatrix(int,class mwArray &,class mwArray const &,class mwArray const &)" (__imp_?multiplymatrix@@YAXHAAVmwArray@@ABV1@1@Z) referenced in function "void * __cdecl run_main(void *)" (?run_main@@YAPAXPAX@Z) 1>matrixdriver.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) void __cdecl addmatrix(int,class mwArray &,class mwArray const &,class mwArray
C++ Projects that Use LabWindows™/CVI™ Functions? Primary Software: LabWindows/CVI Development Systems>>LabWindows/CVI Base Package Primary Software Version: 2009 SP1 Primary Software Fixed Version: N/A Secondary Software: N/A Problem: I am trying to use LabWindows/CVI functions in my Visual Studio C++ project, but when I try to compile my code I receive linking errors similar to the following:error LNK2019: unresolved external symbol How can I resolve this error? Solution: In order to compile LabWindows/CVI functions in a Visual Studio C++ program, you first have to build the functions into a dynamic-link library (DLL) with an import library, and then link the import library (.lib) to your C++ project. To build the functions into a DLL and resolve the link errors, complete the following steps: Note:If the functions you are trying to use are already bundled into a DLL with an import library, you can skip steps 1 through 6. If the instrument driver that includes the functions is not already loaded into LabWindows/CVI, you will need to load it by going to Instrument»Load. In the dialog box that opens, navigate to the .fp file of interest and click Load. Open the Function Tree Editor by going to File»Open»Function Tree (*.fp).In the dialog box that opens, navigate to the .fp file of interest and click Load. Create a DLL project by going to Options»Create DLL Project. Specify a path and name for your project and click Save.A message will pop up asking you if you want to load the DLL project now, similar to the dialog below. Click Yes. Before building the DLL, you will need to configure some of the build settings. First set the build target type by going toBuild»Target Typeand making sure there is a checkmark next to Dynamic Link Library. Also set the project to release mode by going to Build»Configurationand ensuring there is a checkmark next to Release. Configure the target settings by going to Build»Target Settings. Change the Run-time supportoption to Full run-time engine, as shown in the image below: Also change the type library settings by clicking Type Library and unchecking Add type library resource to DLL, as shown in the images below. If you do not uncheck this option, you may run into a type definition error when attempting to build, similar to the following:Definitions for